1. Walking Dead Go. Imagine your avatar walking around on the world map with Zombies popping up in AR that you battle. Pokestops would be places to resupply while you drop off survivors you encounter at “gyms” (shelters).
Game of Thrones Go: Choose House Stark, House Targaryen. Raise armies and trainers knights and battle for control of Pokestops and Gyms for the glory of your house.
Super Mario Bros. Go: Stomp through Koopas, Goombas and other baddies on the Google map to claim pokestops for Mushroom Kingdom.
The Purge Go: Find and kill your rivals stationed at portals/stops.
Legend of Zelda Go: cause it would be fucking awesome. Move around the overworld killing baddies, when you reach a portal/pokestop you go to dungeon game where you explore and capture a dungeon for your team. Your Shadow Link defends it.
Jedi vs Sith: Star Wars Go: Capture and claim temples and link them up like ingress to capture the planet.